Patent GB-189917895-A (GB)
Title: Improvements in and relating to the Making of Moulds for Casting Metals.
Inventor: COOPER HARRY CLIFFORD
Filed: 1899-09-05
Granted: 1900-03-10
Abstract: 17,895. Cooper, H. C. Sept. 5. Moulding. - Relates to modifications of the machine described in Specification No. 17,876, A.D. 1899, the modified machine having duplicate sets of mechanism, so that it may be used to form both the cope and drag of one pattern simultaneously, or may form separately the cope or drag of a pattern twice the size. The pattern and flask supports are contained in a casing C carried by a plate A<7> on the piston-rod A<6> of a cylinder A' with a valve rod A<5>. The casing C is guided by rods A<9>, which support a casing B, on which are fixed sand reservoirs J with doors as described in the Specification mentioned above. The flask E is placed in position by means, such as those previously described. The inner false flask F is held up in the casing B by catches released by a rod E<16>, which also releases catches holding up the outer false flask E<3>. The inner false flask drops on to the runner box, as previously described. Sand boxes (not shown) rest on the outer false flask, and fall, when required, till they are clear of the pressure plate B<4>. A plunger with sprue-forming pins H<1> is provided as previously described. The rod E<16> is pulled down by the fall of the flask E, and serves to release the sprue-forming pins and the plunger and to operate the sand doors throughthe rod E<13>. The patterns are carried by the plate A<7>, so that they may be operated in any desired order. A crank shaft A<12>, supported on the plate A<7>, is connected to a frame K, adjustably supporting a frame K<7> which constitutes the lower sand box and supports the flask proper. A frame M, resting on the frame K, has two sets of patternsupporting strips M<6>, and carries a crank shaft M<8> connected to a frame 0 having supporting-strips O<3>. The plate A<7> has pattern-supporting strips P<1>. The tripping mechanism for the crank shafts &c. is contained in a casing D, and can be operated when desired to vary the compression given to any particular portion of the pattern. This mechanism is controlled by the valve rod R<5> of a cylinder R<9>. As the casing C rises, a shoulder on the valve rod R<5> contacts with a shoulder on the rod A<5>, and thus operates the piston-rod R" of the cylinder R<9>. This effects the operation of the vent-pin board, which is of the construction described in the prior Specification. The valve rod R<5> is then operated by a handle R<8>, to lower the piston-rod R", withdrawing the vent-pins, and stripping the plunger and sprue-pins. This also allows the parts of the pattern on, the strips M<6>, O<3> to be stripped by the falling uf those strips. The valve rod R<5> also operates the valve rod A<5> to withdraw the pistonrod A<6>, stripping the remainder of the pattern. The arrangement described is suitable for forming the cope. To form the drag, the sprue-pins, plunger, and inner false flask are omitted. The bottom board is inserted as described in the prior Specification. To form a number of patterns in one flask, the plunger and sprue pins H<1> are disconnected, and the hole in the pressure plate B' plugged. Plugs are then removed from various parts of the pressure plate, so that sprue pins may be inserted where desired. The sprue pins have spring plungers which are released at any desired moment and act as described in the prior Specification. For forming the cope and drag simultaneously, the sprue pins, plunger, and inner false flask are disconnected, and slight alterations made in the arrangement of the parts.